text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Texas Instruments System Control Interface Protocol Driver
   *
   * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   *	Nishanth Menon
   */
  
  #define pr_fmt(fmt) "%s: " fmt, __func__
  
  #include <linux/bitmap.h>
  #include <linux/debugfs.h>
  #include <linux/export.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  #include <linux/mailbox_client.h>
  #include <linux/module.h>
  #include <linux/of_device.h>
  #include <linux/semaphore.h>
  #include <linux/slab.h>
  #include <linux/soc/ti/ti-msgmgr.h>
  #include <linux/soc/ti/ti_sci_protocol.h>
  #include <linux/reboot.h>
  
  #include "ti_sci.h"
  
  /* List of all TI SCI devices active in system */
  static LIST_HEAD(ti_sci_list);
  /* Protection for the entire list */
  static DEFINE_MUTEX(ti_sci_list_mutex);
  
  /**
   * struct ti_sci_xfer - Structure representing a message flow
   * @tx_message:	Transmit message
   * @rx_len:	Receive message length
   * @xfer_buf:	Preallocated buffer to store receive message
   *		Since we work with request-ACK protocol, we can
   *		reuse the same buffer for the rx path as we
   *		use for the tx path.
   * @done:	completion event
   */
  struct ti_sci_xfer {
  	struct ti_msgmgr_message tx_message;
  	u8 rx_len;
  	u8 *xfer_buf;
  	struct completion done;
  };
  
  /**
   * struct ti_sci_xfers_info - Structure to manage transfer information
   * @sem_xfer_count:	Counting Semaphore for managing max simultaneous
   *			Messages.
   * @xfer_block:		Preallocated Message array
   * @xfer_alloc_table:	Bitmap table for allocated messages.
   *			Index of this bitmap table is also used for message
   *			sequence identifier.
   * @xfer_lock:		Protection for message allocation
   */
  struct ti_sci_xfers_info {
  	struct semaphore sem_xfer_count;
  	struct ti_sci_xfer *xfer_block;
  	unsigned long *xfer_alloc_table;
  	/* protect transfer allocation */
  	spinlock_t xfer_lock;
  };
  
  /**
   * struct ti_sci_rm_type_map - Structure representing TISCI Resource
   *				management representation of dev_ids.
   * @dev_id:	TISCI device ID
   * @type:	Corresponding id as identified by TISCI RM.
   *
   * Note: This is used only as a work around for using RM range apis
   *	for AM654 SoC. For future SoCs dev_id will be used as type
   *	for RM range APIs. In order to maintain ABI backward compatibility
   *	type is not being changed for AM654 SoC.
   */
  struct ti_sci_rm_type_map {
  	u32 dev_id;
  	u16 type;
  };
  
  /**
   * struct ti_sci_desc - Description of SoC integration
   * @default_host_id:	Host identifier representing the compute entity
   * @max_rx_timeout_ms:	Timeout for communication with SoC (in Milliseconds)
   * @max_msgs: Maximum number of messages that can be pending
   *		  simultaneously in the system
   * @max_msg_size: Maximum size of data per message that can be handled.
   * @rm_type_map: RM resource type mapping structure.
   */
  struct ti_sci_desc {
  	u8 default_host_id;
  	int max_rx_timeout_ms;
  	int max_msgs;
  	int max_msg_size;
  	struct ti_sci_rm_type_map *rm_type_map;
  };
  
  /**
   * struct ti_sci_info - Structure representing a TI SCI instance
   * @dev:	Device pointer
   * @desc:	SoC description for this instance
   * @nb:	Reboot Notifier block
   * @d:		Debugfs file entry
   * @debug_region: Memory region where the debug message are available
   * @debug_region_size: Debug region size
   * @debug_buffer: Buffer allocated to copy debug messages.
   * @handle:	Instance of TI SCI handle to send to clients.
   * @cl:		Mailbox Client
   * @chan_tx:	Transmit mailbox channel
   * @chan_rx:	Receive mailbox channel
   * @minfo:	Message info
   * @node:	list head
   * @host_id:	Host ID
   * @users:	Number of users of this instance
   */
  struct ti_sci_info {
  	struct device *dev;
  	struct notifier_block nb;
  	const struct ti_sci_desc *desc;
  	struct dentry *d;
  	void __iomem *debug_region;
  	char *debug_buffer;
  	size_t debug_region_size;
  	struct ti_sci_handle handle;
  	struct mbox_client cl;
  	struct mbox_chan *chan_tx;
  	struct mbox_chan *chan_rx;
  	struct ti_sci_xfers_info minfo;
  	struct list_head node;
  	u8 host_id;
  	/* protected by ti_sci_list_mutex */
  	int users;
  
  };
  
  #define cl_to_ti_sci_info(c)	container_of(c, struct ti_sci_info, cl)
  #define handle_to_ti_sci_info(h) container_of(h, struct ti_sci_info, handle)
  #define reboot_to_ti_sci_info(n) container_of(n, struct ti_sci_info, nb)
  
  #ifdef CONFIG_DEBUG_FS
  
  /**
   * ti_sci_debug_show() - Helper to dump the debug log
   * @s:	sequence file pointer
   * @unused:	unused.
   *
   * Return: 0
   */
  static int ti_sci_debug_show(struct seq_file *s, void *unused)
  {
  	struct ti_sci_info *info = s->private;
  
  	memcpy_fromio(info->debug_buffer, info->debug_region,
  		      info->debug_region_size);
  	/*
  	 * We don't trust firmware to leave NULL terminated last byte (hence
  	 * we have allocated 1 extra 0 byte). Since we cannot guarantee any
  	 * specific data format for debug messages, We just present the data
  	 * in the buffer as is - we expect the messages to be self explanatory.
  	 */
  	seq_puts(s, info->debug_buffer);
  	return 0;
  }
  
  /* Provide the log file operations interface*/
  DEFINE_SHOW_ATTRIBUTE(ti_sci_debug);
  
  /**
   * ti_sci_debugfs_create() - Create log debug file
   * @pdev:	platform device pointer
   * @info:	Pointer to SCI entity information
   *
   * Return: 0 if all went fine, else corresponding error.
   */
  static int ti_sci_debugfs_create(struct platform_device *pdev,
  				 struct ti_sci_info *info)
  {
  	struct device *dev = &pdev->dev;
  	struct resource *res;
  	char debug_name[50] = "ti_sci_debug@";
  
  	/* Debug region is optional */
  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
  					   "debug_messages");
  	info->debug_region = devm_ioremap_resource(dev, res);
  	if (IS_ERR(info->debug_region))
  		return 0;
  	info->debug_region_size = resource_size(res);
  
  	info->debug_buffer = devm_kcalloc(dev, info->debug_region_size + 1,
  					  sizeof(char), GFP_KERNEL);
  	if (!info->debug_buffer)
  		return -ENOMEM;
  	/* Setup NULL termination */
  	info->debug_buffer[info->debug_region_size] = 0;
  
  	info->d = debugfs_create_file(strncat(debug_name, dev_name(dev),
  					      sizeof(debug_name) -
  					      sizeof("ti_sci_debug@")),
  				      0444, NULL, info, &ti_sci_debug_fops);
  	if (IS_ERR(info->d))
  		return PTR_ERR(info->d);
  
  	dev_dbg(dev, "Debug region => %p, size = %zu bytes, resource: %pr\n",
  		info->debug_region, info->debug_region_size, res);
  	return 0;
  }
  
  /**
   * ti_sci_debugfs_destroy() - clean up log debug file
   * @pdev:	platform device pointer
   * @info:	Pointer to SCI entity information
   */
  static void ti_sci_debugfs_destroy(struct platform_device *pdev,
  				   struct ti_sci_info *info)
  {
  	if (IS_ERR(info->debug_region))
  		return;
  
  	debugfs_remove(info->d);
  }
  #else /* CONFIG_DEBUG_FS */
  static inline int ti_sci_debugfs_create(struct platform_device *dev,
  					struct ti_sci_info *info)
  {
  	return 0;
  }
  
  static inline void ti_sci_debugfs_destroy(struct platform_device *dev,
  					  struct ti_sci_info *info)
  {
  }
  #endif /* CONFIG_DEBUG_FS */
  
  /**
   * ti_sci_dump_header_dbg() - Helper to dump a message header.
   * @dev:	Device pointer corresponding to the SCI entity
   * @hdr:	pointer to header.
   */
  static inline void ti_sci_dump_header_dbg(struct device *dev,
  					  struct ti_sci_msg_hdr *hdr)
  {
  	dev_dbg(dev, "MSGHDR:type=0x%04x host=0x%02x seq=0x%02x flags=0x%08x\n",
  		hdr->type, hdr->host, hdr->seq, hdr->flags);
  }
  
  /**
   * ti_sci_rx_callback() - mailbox client callback for receive messages
   * @cl:	client pointer
   * @m:	mailbox message
   *
   * Processes one received message to appropriate transfer information and
   * signals completion of the transfer.
   *
   * NOTE: This function will be invoked in IRQ context, hence should be
   * as optimal as possible.
   */
  static void ti_sci_rx_callback(struct mbox_client *cl, void *m)
  {
  	struct ti_sci_info *info = cl_to_ti_sci_info(cl);
  	struct device *dev = info->dev;
  	struct ti_sci_xfers_info *minfo = &info->minfo;
  	struct ti_msgmgr_message *mbox_msg = m;
  	struct ti_sci_msg_hdr *hdr = (struct ti_sci_msg_hdr *)mbox_msg->buf;
  	struct ti_sci_xfer *xfer;
  	u8 xfer_id;
  
  	xfer_id = hdr->seq;
  
  	/*
  	 * Are we even expecting this?
  	 * NOTE: barriers were implicit in locks used for modifying the bitmap
  	 */
  	if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
  		dev_err(dev, "Message for %d is not expected!\n", xfer_id);
  		return;
  	}
  
  	xfer = &minfo->xfer_block[xfer_id];
  
  	/* Is the message of valid length? */
  	if (mbox_msg->len > info->desc->max_msg_size) {
  		dev_err(dev, "Unable to handle %zu xfer(max %d)\n",
  			mbox_msg->len, info->desc->max_msg_size);
  		ti_sci_dump_header_dbg(dev, hdr);
  		return;
  	}
  	if (mbox_msg->len < xfer->rx_len) {
  		dev_err(dev, "Recv xfer %zu < expected %d length\n",
  			mbox_msg->len, xfer->rx_len);
  		ti_sci_dump_header_dbg(dev, hdr);
  		return;
  	}
  
  	ti_sci_dump_header_dbg(dev, hdr);
  	/* Take a copy to the rx buffer.. */
  	memcpy(xfer->xfer_buf, mbox_msg->buf, xfer->rx_len);
  	complete(&xfer->done);
  }
  
  /**
   * ti_sci_get_one_xfer() - Allocate one message
   * @info:	Pointer to SCI entity information
   * @msg_type:	Message type
   * @msg_flags:	Flag to set for the message
   * @tx_message_size: transmit message size
   * @rx_message_size: receive message size
   *
   * Helper function which is used by various command functions that are
   * exposed to clients of this driver for allocating a message traffic event.
   *
   * This function can sleep depending on pending requests already in the system
   * for the SCI entity. Further, this also holds a spinlock to maintain integrity
   * of internal data structures.
   *
   * Return: 0 if all went fine, else corresponding error.
   */
  static struct ti_sci_xfer *ti_sci_get_one_xfer(struct ti_sci_info *info,
  					       u16 msg_type, u32 msg_flags,
  					       size_t tx_message_size,
  					       size_t rx_message_size)
  {
  	struct ti_sci_xfers_info *minfo = &info->minfo;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_msg_hdr *hdr;
  	unsigned long flags;
  	unsigned long bit_pos;
  	u8 xfer_id;
  	int ret;
  	int timeout;
  
  	/* Ensure we have sane transfer sizes */
  	if (rx_message_size > info->desc->max_msg_size ||
  	    tx_message_size > info->desc->max_msg_size ||
  	    rx_message_size < sizeof(*hdr) || tx_message_size < sizeof(*hdr))
  		return ERR_PTR(-ERANGE);
  
  	/*
  	 * Ensure we have only controlled number of pending messages.
  	 * Ideally, we might just have to wait a single message, be
  	 * conservative and wait 5 times that..
  	 */
  	timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms) * 5;
  	ret = down_timeout(&minfo->sem_xfer_count, timeout);
  	if (ret < 0)
  		return ERR_PTR(ret);
  
  	/* Keep the locked section as small as possible */
  	spin_lock_irqsave(&minfo->xfer_lock, flags);
  	bit_pos = find_first_zero_bit(minfo->xfer_alloc_table,
  				      info->desc->max_msgs);
  	set_bit(bit_pos, minfo->xfer_alloc_table);
  	spin_unlock_irqrestore(&minfo->xfer_lock, flags);
  
  	/*
  	 * We already ensured in probe that we can have max messages that can
  	 * fit in  hdr.seq - NOTE: this improves access latencies
  	 * to predictable O(1) access, BUT, it opens us to risk if
  	 * remote misbehaves with corrupted message sequence responses.
  	 * If that happens, we are going to be messed up anyways..
  	 */
  	xfer_id = (u8)bit_pos;
  
  	xfer = &minfo->xfer_block[xfer_id];
  
  	hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  	xfer->tx_message.len = tx_message_size;
  	xfer->rx_len = (u8)rx_message_size;
  
  	reinit_completion(&xfer->done);
  
  	hdr->seq = xfer_id;
  	hdr->type = msg_type;
  	hdr->host = info->host_id;
  	hdr->flags = msg_flags;
  
  	return xfer;
  }
  
  /**
   * ti_sci_put_one_xfer() - Release a message
   * @minfo:	transfer info pointer
   * @xfer:	message that was reserved by ti_sci_get_one_xfer
   *
   * This holds a spinlock to maintain integrity of internal data structures.
   */
  static void ti_sci_put_one_xfer(struct ti_sci_xfers_info *minfo,
  				struct ti_sci_xfer *xfer)
  {
  	unsigned long flags;
  	struct ti_sci_msg_hdr *hdr;
  	u8 xfer_id;
  
  	hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  	xfer_id = hdr->seq;
  
  	/*
  	 * Keep the locked section as small as possible
  	 * NOTE: we might escape with smp_mb and no lock here..
  	 * but just be conservative and symmetric.
  	 */
  	spin_lock_irqsave(&minfo->xfer_lock, flags);
  	clear_bit(xfer_id, minfo->xfer_alloc_table);
  	spin_unlock_irqrestore(&minfo->xfer_lock, flags);
  
  	/* Increment the count for the next user to get through */
  	up(&minfo->sem_xfer_count);
  }
  
  /**
   * ti_sci_do_xfer() - Do one transfer
   * @info:	Pointer to SCI entity information
   * @xfer:	Transfer to initiate and wait for response
   *
   * Return: -ETIMEDOUT in case of no response, if transmit error,
   *	   return corresponding error, else if all goes well,
   *	   return 0.
   */
  static inline int ti_sci_do_xfer(struct ti_sci_info *info,
  				 struct ti_sci_xfer *xfer)
  {
  	int ret;
  	int timeout;
  	struct device *dev = info->dev;
  
  	ret = mbox_send_message(info->chan_tx, &xfer->tx_message);
  	if (ret < 0)
  		return ret;
  
  	ret = 0;
  
  	/* And we wait for the response. */
  	timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
  	if (!wait_for_completion_timeout(&xfer->done, timeout)) {
  		dev_err(dev, "Mbox timedout in resp(caller: %pS)\n",
  			(void *)_RET_IP_);
  		ret = -ETIMEDOUT;
  	}
  	/*
  	 * NOTE: we might prefer not to need the mailbox ticker to manage the
  	 * transfer queueing since the protocol layer queues things by itself.
  	 * Unfortunately, we have to kick the mailbox framework after we have
  	 * received our message.
  	 */
  	mbox_client_txdone(info->chan_tx, ret);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_revision() - command to get the revision of the SCI entity
   * @info:	Pointer to SCI entity information
   *
   * Updates the SCI information in the internal data structure.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_get_revision(struct ti_sci_info *info)
  {
  	struct device *dev = info->dev;
  	struct ti_sci_handle *handle = &info->handle;
  	struct ti_sci_version_info *ver = &handle->version;
  	struct ti_sci_msg_resp_version *rev_info;
  	struct ti_sci_xfer *xfer;
  	int ret;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(struct ti_sci_msg_hdr),
  				   sizeof(*rev_info));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  
  	rev_info = (struct ti_sci_msg_resp_version *)xfer->xfer_buf;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	ver->abi_major = rev_info->abi_major;
  	ver->abi_minor = rev_info->abi_minor;
  	ver->firmware_revision = rev_info->firmware_revision;
  	strncpy(ver->firmware_description, rev_info->firmware_description,
  		sizeof(ver->firmware_description));
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	return ret;
  }
  
  /**
   * ti_sci_is_response_ack() - Generic ACK/NACK message checkup
   * @r:	pointer to response buffer
   *
   * Return: true if the response was an ACK, else returns false.
   */
  static inline bool ti_sci_is_response_ack(void *r)
  {
  	struct ti_sci_msg_hdr *hdr = r;
  
  	return hdr->flags & TI_SCI_FLAG_RESP_GENERIC_ACK ? true : false;
  }
  
  /**
   * ti_sci_set_device_state() - Set device state helper
   * @handle:	pointer to TI SCI handle
   * @id:		Device identifier
   * @flags:	flags to setup for the device
   * @state:	State to move the device to
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_set_device_state(const struct ti_sci_handle *handle,
  				   u32 id, u32 flags, u8 state)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_set_device_state *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_STATE,
  				   flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_device_state *)xfer->xfer_buf;
  	req->id = id;
  	req->state = state;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_get_device_state() - Get device state helper
   * @handle:	Handle to the device
   * @id:		Device Identifier
   * @clcnt:	Pointer to Context Loss Count
   * @resets:	pointer to resets
   * @p_state:	pointer to p_state
   * @c_state:	pointer to c_state
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
  				   u32 id,  u32 *clcnt,  u32 *resets,
  				    u8 *p_state,  u8 *c_state)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_get_device_state *req;
  	struct ti_sci_msg_resp_get_device_state *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	if (!clcnt && !resets && !p_state && !c_state)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_device_state *)xfer->xfer_buf;
  	req->id = id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_device_state *)xfer->xfer_buf;
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  		goto fail;
  	}
  
  	if (clcnt)
  		*clcnt = resp->context_loss_count;
  	if (resets)
  		*resets = resp->resets;
  	if (p_state)
  		*p_state = resp->programmed_state;
  	if (c_state)
  		*c_state = resp->current_state;
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_device() - command to request for device managed by TISCI
   * @handle:	Pointer to TISCI handle as retrieved by *ti_sci_get_handle
   * @id:		Device Identifier
   *
   * Request for the device - NOTE: the client MUST maintain integrity of
   * usage count by balancing get_device with put_device. No refcounting is
   * managed by driver for that purpose.
   *
   * NOTE: The request is for exclusive access for the processor.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
  {
  	return ti_sci_set_device_state(handle, id,
  				       MSG_FLAG_DEVICE_EXCLUSIVE,
  				       MSG_DEVICE_SW_STATE_ON);
  }
  
  /**
   * ti_sci_cmd_idle_device() - Command to idle a device managed by TISCI
   * @handle:	Pointer to TISCI handle as retrieved by *ti_sci_get_handle
   * @id:		Device Identifier
   *
   * Request for the device - NOTE: the client MUST maintain integrity of
   * usage count by balancing get_device with put_device. No refcounting is
   * managed by driver for that purpose.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
  {
  	return ti_sci_set_device_state(handle, id,
  				       MSG_FLAG_DEVICE_EXCLUSIVE,
  				       MSG_DEVICE_SW_STATE_RETENTION);
  }
  
  /**
   * ti_sci_cmd_put_device() - command to release a device managed by TISCI
   * @handle:	Pointer to TISCI handle as retrieved by *ti_sci_get_handle
   * @id:		Device Identifier
   *
   * Request for the device - NOTE: the client MUST maintain integrity of
   * usage count by balancing get_device with put_device. No refcounting is
   * managed by driver for that purpose.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_put_device(const struct ti_sci_handle *handle, u32 id)
  {
  	return ti_sci_set_device_state(handle, id,
  				       0, MSG_DEVICE_SW_STATE_AUTO_OFF);
  }
  
  /**
   * ti_sci_cmd_dev_is_valid() - Is the device valid
   * @handle:	Pointer to TISCI handle as retrieved by *ti_sci_get_handle
   * @id:		Device Identifier
   *
   * Return: 0 if all went fine and the device ID is valid, else return
   * appropriate error.
   */
  static int ti_sci_cmd_dev_is_valid(const struct ti_sci_handle *handle, u32 id)
  {
  	u8 unused;
  
  	/* check the device state which will also tell us if the ID is valid */
  	return ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &unused);
  }
  
  /**
   * ti_sci_cmd_dev_get_clcnt() - Get context loss counter
   * @handle:	Pointer to TISCI handle
   * @id:		Device Identifier
   * @count:	Pointer to Context Loss counter to populate
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_dev_get_clcnt(const struct ti_sci_handle *handle, u32 id,
  				    u32 *count)
  {
  	return ti_sci_get_device_state(handle, id, count, NULL, NULL, NULL);
  }
  
  /**
   * ti_sci_cmd_dev_is_idle() - Check if the device is requested to be idle
   * @handle:	Pointer to TISCI handle
   * @id:		Device Identifier
   * @r_state:	true if requested to be idle
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_dev_is_idle(const struct ti_sci_handle *handle, u32 id,
  				  bool *r_state)
  {
  	int ret;
  	u8 state;
  
  	if (!r_state)
  		return -EINVAL;
  
  	ret = ti_sci_get_device_state(handle, id, NULL, NULL, &state, NULL);
  	if (ret)
  		return ret;
  
  	*r_state = (state == MSG_DEVICE_SW_STATE_RETENTION);
  
  	return 0;
  }
  
  /**
   * ti_sci_cmd_dev_is_stop() - Check if the device is requested to be stopped
   * @handle:	Pointer to TISCI handle
   * @id:		Device Identifier
   * @r_state:	true if requested to be stopped
   * @curr_state:	true if currently stopped.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_dev_is_stop(const struct ti_sci_handle *handle, u32 id,
  				  bool *r_state,  bool *curr_state)
  {
  	int ret;
  	u8 p_state, c_state;
  
  	if (!r_state && !curr_state)
  		return -EINVAL;
  
  	ret =
  	    ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
  	if (ret)
  		return ret;
  
  	if (r_state)
  		*r_state = (p_state == MSG_DEVICE_SW_STATE_AUTO_OFF);
  	if (curr_state)
  		*curr_state = (c_state == MSG_DEVICE_HW_STATE_OFF);
  
  	return 0;
  }
  
  /**
   * ti_sci_cmd_dev_is_on() - Check if the device is requested to be ON
   * @handle:	Pointer to TISCI handle
   * @id:		Device Identifier
   * @r_state:	true if requested to be ON
   * @curr_state:	true if currently ON and active
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_dev_is_on(const struct ti_sci_handle *handle, u32 id,
  				bool *r_state,  bool *curr_state)
  {
  	int ret;
  	u8 p_state, c_state;
  
  	if (!r_state && !curr_state)
  		return -EINVAL;
  
  	ret =
  	    ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
  	if (ret)
  		return ret;
  
  	if (r_state)
  		*r_state = (p_state == MSG_DEVICE_SW_STATE_ON);
  	if (curr_state)
  		*curr_state = (c_state == MSG_DEVICE_HW_STATE_ON);
  
  	return 0;
  }
  
  /**
   * ti_sci_cmd_dev_is_trans() - Check if the device is currently transitioning
   * @handle:	Pointer to TISCI handle
   * @id:		Device Identifier
   * @curr_state:	true if currently transitioning.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_dev_is_trans(const struct ti_sci_handle *handle, u32 id,
  				   bool *curr_state)
  {
  	int ret;
  	u8 state;
  
  	if (!curr_state)
  		return -EINVAL;
  
  	ret = ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &state);
  	if (ret)
  		return ret;
  
  	*curr_state = (state == MSG_DEVICE_HW_STATE_TRANS);
  
  	return 0;
  }
  
  /**
   * ti_sci_cmd_set_device_resets() - command to set resets for device managed
   *				    by TISCI
   * @handle:	Pointer to TISCI handle as retrieved by *ti_sci_get_handle
   * @id:		Device Identifier
   * @reset_state: Device specific reset bit field
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_set_device_resets(const struct ti_sci_handle *handle,
  					u32 id, u32 reset_state)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_set_device_resets *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_RESETS,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_device_resets *)xfer->xfer_buf;
  	req->id = id;
  	req->resets = reset_state;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_device_resets() - Get reset state for device managed
   *				    by TISCI
   * @handle:		Pointer to TISCI handle
   * @id:			Device Identifier
   * @reset_state:	Pointer to reset state to populate
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_get_device_resets(const struct ti_sci_handle *handle,
  					u32 id, u32 *reset_state)
  {
  	return ti_sci_get_device_state(handle, id, NULL, reset_state, NULL,
  				       NULL);
  }
  
  /**
   * ti_sci_set_clock_state() - Set clock state helper
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @flags:	Header flags as needed
   * @state:	State to request for the clock.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_set_clock_state(const struct ti_sci_handle *handle,
  				  u32 dev_id, u32 clk_id,
  				  u32 flags, u8 state)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_set_clock_state *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_STATE,
  				   flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_clock_state *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  	req->request_state = state;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_clock_state() - Get clock state helper
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @programmed_state:	State requested for clock to move to
   * @current_state:	State that the clock is currently in
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_get_clock_state(const struct ti_sci_handle *handle,
  				      u32 dev_id, u32 clk_id,
  				      u8 *programmed_state, u8 *current_state)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_get_clock_state *req;
  	struct ti_sci_msg_resp_get_clock_state *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	if (!programmed_state && !current_state)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_STATE,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_clock_state *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_clock_state *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  		goto fail;
  	}
  
  	if (programmed_state)
  		*programmed_state = resp->programmed_state;
  	if (current_state)
  		*current_state = resp->current_state;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_clock() - Get control of a clock from TI SCI
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @needs_ssc: 'true' if Spread Spectrum clock is desired, else 'false'
   * @can_change_freq: 'true' if frequency change is desired, else 'false'
   * @enable_input_term: 'true' if input termination is desired, else 'false'
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_get_clock(const struct ti_sci_handle *handle, u32 dev_id,
  				u32 clk_id, bool needs_ssc,
  				bool can_change_freq, bool enable_input_term)
  {
  	u32 flags = 0;
  
  	flags |= needs_ssc ? MSG_FLAG_CLOCK_ALLOW_SSC : 0;
  	flags |= can_change_freq ? MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE : 0;
  	flags |= enable_input_term ? MSG_FLAG_CLOCK_INPUT_TERM : 0;
  
  	return ti_sci_set_clock_state(handle, dev_id, clk_id, flags,
  				      MSG_CLOCK_SW_STATE_REQ);
  }
  
  /**
   * ti_sci_cmd_idle_clock() - Idle a clock which is in our control
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   *
   * NOTE: This clock must have been requested by get_clock previously.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_idle_clock(const struct ti_sci_handle *handle,
  				 u32 dev_id, u32 clk_id)
  {
  	return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
  				      MSG_CLOCK_SW_STATE_UNREQ);
  }
  
  /**
   * ti_sci_cmd_put_clock() - Release a clock from our control back to TISCI
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   *
   * NOTE: This clock must have been requested by get_clock previously.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_put_clock(const struct ti_sci_handle *handle,
  				u32 dev_id, u32 clk_id)
  {
  	return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
  				      MSG_CLOCK_SW_STATE_AUTO);
  }
  
  /**
   * ti_sci_cmd_clk_is_auto() - Is the clock being auto managed
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @req_state: state indicating if the clock is auto managed
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_is_auto(const struct ti_sci_handle *handle,
  				  u32 dev_id, u32 clk_id, bool *req_state)
  {
  	u8 state = 0;
  	int ret;
  
  	if (!req_state)
  		return -EINVAL;
  
  	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id, &state, NULL);
  	if (ret)
  		return ret;
  
  	*req_state = (state == MSG_CLOCK_SW_STATE_AUTO);
  	return 0;
  }
  
  /**
   * ti_sci_cmd_clk_is_on() - Is the clock ON
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @req_state: state indicating if the clock is managed by us and enabled
   * @curr_state: state indicating if the clock is ready for operation
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_is_on(const struct ti_sci_handle *handle, u32 dev_id,
  				u32 clk_id, bool *req_state, bool *curr_state)
  {
  	u8 c_state = 0, r_state = 0;
  	int ret;
  
  	if (!req_state && !curr_state)
  		return -EINVAL;
  
  	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
  					 &r_state, &c_state);
  	if (ret)
  		return ret;
  
  	if (req_state)
  		*req_state = (r_state == MSG_CLOCK_SW_STATE_REQ);
  	if (curr_state)
  		*curr_state = (c_state == MSG_CLOCK_HW_STATE_READY);
  	return 0;
  }
  
  /**
   * ti_sci_cmd_clk_is_off() - Is the clock OFF
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @req_state: state indicating if the clock is managed by us and disabled
   * @curr_state: state indicating if the clock is NOT ready for operation
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_is_off(const struct ti_sci_handle *handle, u32 dev_id,
  				 u32 clk_id, bool *req_state, bool *curr_state)
  {
  	u8 c_state = 0, r_state = 0;
  	int ret;
  
  	if (!req_state && !curr_state)
  		return -EINVAL;
  
  	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
  					 &r_state, &c_state);
  	if (ret)
  		return ret;
  
  	if (req_state)
  		*req_state = (r_state == MSG_CLOCK_SW_STATE_UNREQ);
  	if (curr_state)
  		*curr_state = (c_state == MSG_CLOCK_HW_STATE_NOT_READY);
  	return 0;
  }
  
  /**
   * ti_sci_cmd_clk_set_parent() - Set the clock source of a specific device clock
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @parent_id:	Parent clock identifier to set
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_set_parent(const struct ti_sci_handle *handle,
  				     u32 dev_id, u32 clk_id, u32 parent_id)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_set_clock_parent *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_PARENT,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_clock_parent *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  	if (parent_id < 255) {
  		req->parent_id = parent_id;
  	} else {
  		req->parent_id = 255;
  		req->parent_id_32 = parent_id;
  	}
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_clk_get_parent() - Get current parent clock source
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @parent_id:	Current clock parent
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_get_parent(const struct ti_sci_handle *handle,
  				     u32 dev_id, u32 clk_id, u32 *parent_id)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_get_clock_parent *req;
  	struct ti_sci_msg_resp_get_clock_parent *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle || !parent_id)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_PARENT,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_clock_parent *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_clock_parent *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  	} else {
  		if (resp->parent_id < 255)
  			*parent_id = resp->parent_id;
  		else
  			*parent_id = resp->parent_id_32;
  	}
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_clk_get_num_parents() - Get num parents of the current clk source
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @num_parents: Returns he number of parents to the current clock.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_get_num_parents(const struct ti_sci_handle *handle,
  					  u32 dev_id, u32 clk_id,
  					  u32 *num_parents)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_get_clock_num_parents *req;
  	struct ti_sci_msg_resp_get_clock_num_parents *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle || !num_parents)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_NUM_CLOCK_PARENTS,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_clock_num_parents *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_clock_num_parents *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  	} else {
  		if (resp->num_parents < 255)
  			*num_parents = resp->num_parents;
  		else
  			*num_parents = resp->num_parents_32;
  	}
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_clk_get_match_freq() - Find a good match for frequency
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @min_freq:	The minimum allowable frequency in Hz. This is the minimum
   *		allowable programmed frequency and does not account for clock
   *		tolerances and jitter.
   * @target_freq: The target clock frequency in Hz. A frequency will be
   *		processed as close to this target frequency as possible.
   * @max_freq:	The maximum allowable frequency in Hz. This is the maximum
   *		allowable programmed frequency and does not account for clock
   *		tolerances and jitter.
   * @match_freq:	Frequency match in Hz response.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_get_match_freq(const struct ti_sci_handle *handle,
  					 u32 dev_id, u32 clk_id, u64 min_freq,
  					 u64 target_freq, u64 max_freq,
  					 u64 *match_freq)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_query_clock_freq *req;
  	struct ti_sci_msg_resp_query_clock_freq *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle || !match_freq)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_QUERY_CLOCK_FREQ,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_query_clock_freq *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  	req->min_freq_hz = min_freq;
  	req->target_freq_hz = target_freq;
  	req->max_freq_hz = max_freq;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_query_clock_freq *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp))
  		ret = -ENODEV;
  	else
  		*match_freq = resp->freq_hz;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_clk_set_freq() - Set a frequency for clock
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @min_freq:	The minimum allowable frequency in Hz. This is the minimum
   *		allowable programmed frequency and does not account for clock
   *		tolerances and jitter.
   * @target_freq: The target clock frequency in Hz. A frequency will be
   *		processed as close to this target frequency as possible.
   * @max_freq:	The maximum allowable frequency in Hz. This is the maximum
   *		allowable programmed frequency and does not account for clock
   *		tolerances and jitter.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_set_freq(const struct ti_sci_handle *handle,
  				   u32 dev_id, u32 clk_id, u64 min_freq,
  				   u64 target_freq, u64 max_freq)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_set_clock_freq *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_FREQ,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_clock_freq *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  	req->min_freq_hz = min_freq;
  	req->target_freq_hz = target_freq;
  	req->max_freq_hz = max_freq;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_clk_get_freq() - Get current frequency
   * @handle:	pointer to TI SCI handle
   * @dev_id:	Device identifier this request is for
   * @clk_id:	Clock identifier for the device for this request.
   *		Each device has it's own set of clock inputs. This indexes
   *		which clock input to modify.
   * @freq:	Currently frequency in Hz
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_clk_get_freq(const struct ti_sci_handle *handle,
  				   u32 dev_id, u32 clk_id, u64 *freq)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_get_clock_freq *req;
  	struct ti_sci_msg_resp_get_clock_freq *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle || !freq)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_FREQ,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_clock_freq *)xfer->xfer_buf;
  	req->dev_id = dev_id;
  	if (clk_id < 255) {
  		req->clk_id = clk_id;
  	} else {
  		req->clk_id = 255;
  		req->clk_id_32 = clk_id;
  	}
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_clock_freq *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp))
  		ret = -ENODEV;
  	else
  		*freq = resp->freq_hz;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  static int ti_sci_cmd_core_reboot(const struct ti_sci_handle *handle)
  {
  	struct ti_sci_info *info;
  	struct ti_sci_msg_req_reboot *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SYS_RESET,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_reboot *)xfer->xfer_buf;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp))
  		ret = -ENODEV;
  	else
  		ret = 0;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  static int ti_sci_get_resource_type(struct ti_sci_info *info, u16 dev_id,
  				    u16 *type)
  {
  	struct ti_sci_rm_type_map *rm_type_map = info->desc->rm_type_map;
  	bool found = false;
  	int i;
  
  	/* If map is not provided then assume dev_id is used as type */
  	if (!rm_type_map) {
  		*type = dev_id;
  		return 0;
  	}
  
  	for (i = 0; rm_type_map[i].dev_id; i++) {
  		if (rm_type_map[i].dev_id == dev_id) {
  			*type = rm_type_map[i].type;
  			found = true;
  			break;
  		}
  	}
  
  	if (!found)
  		return -EINVAL;
  
  	return 0;
  }
  
  /**
   * ti_sci_get_resource_range - Helper to get a range of resources assigned
   *			       to a host. Resource is uniquely identified by
   *			       type and subtype.
   * @handle:		Pointer to TISCI handle.
   * @dev_id:		TISCI device ID.
   * @subtype:		Resource assignment subtype that is being requested
   *			from the given device.
   * @s_host:		Host processor ID to which the resources are allocated
   * @range_start:	Start index of the resource range
   * @range_num:		Number of resources in the range
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_get_resource_range(const struct ti_sci_handle *handle,
  				     u32 dev_id, u8 subtype, u8 s_host,
  				     u16 *range_start, u16 *range_num)
  {
  	struct ti_sci_msg_resp_get_resource_range *resp;
  	struct ti_sci_msg_req_get_resource_range *req;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	u16 type;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_RESOURCE_RANGE,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  
  	ret = ti_sci_get_resource_type(info, dev_id, &type);
  	if (ret) {
  		dev_err(dev, "rm type lookup failed for %u\n", dev_id);
  		goto fail;
  	}
  
  	req = (struct ti_sci_msg_req_get_resource_range *)xfer->xfer_buf;
  	req->secondary_host = s_host;
  	req->type = type & MSG_RM_RESOURCE_TYPE_MASK;
  	req->subtype = subtype & MSG_RM_RESOURCE_SUBTYPE_MASK;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_resource_range *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  	} else if (!resp->range_start && !resp->range_num) {
  		ret = -ENODEV;
  	} else {
  		*range_start = resp->range_start;
  		*range_num = resp->range_num;
  	};
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_resource_range - Get a range of resources assigned to host
   *				   that is same as ti sci interface host.
   * @handle:		Pointer to TISCI handle.
   * @dev_id:		TISCI device ID.
   * @subtype:		Resource assignment subtype that is being requested
   *			from the given device.
   * @range_start:	Start index of the resource range
   * @range_num:		Number of resources in the range
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_get_resource_range(const struct ti_sci_handle *handle,
  					 u32 dev_id, u8 subtype,
  					 u16 *range_start, u16 *range_num)
  {
  	return ti_sci_get_resource_range(handle, dev_id, subtype,
  					 TI_SCI_IRQ_SECONDARY_HOST_INVALID,
  					 range_start, range_num);
  }
  
  /**
   * ti_sci_cmd_get_resource_range_from_shost - Get a range of resources
   *					      assigned to a specified host.
   * @handle:		Pointer to TISCI handle.
   * @dev_id:		TISCI device ID.
   * @subtype:		Resource assignment subtype that is being requested
   *			from the given device.
   * @s_host:		Host processor ID to which the resources are allocated
   * @range_start:	Start index of the resource range
   * @range_num:		Number of resources in the range
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static
  int ti_sci_cmd_get_resource_range_from_shost(const struct ti_sci_handle *handle,
  					     u32 dev_id, u8 subtype, u8 s_host,
  					     u16 *range_start, u16 *range_num)
  {
  	return ti_sci_get_resource_range(handle, dev_id, subtype, s_host,
  					 range_start, range_num);
  }
  
  /**
   * ti_sci_manage_irq() - Helper api to configure/release the irq route between
   *			 the requested source and destination
   * @handle:		Pointer to TISCI handle.
   * @valid_params:	Bit fields defining the validity of certain params
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @dst_id:		Device ID of the IRQ destination
   * @dst_host_irq:	IRQ number of the destination device
   * @ia_id:		Device ID of the IA, if the IRQ flows through this IA
   * @vint:		Virtual interrupt to be used within the IA
   * @global_event:	Global event number to be used for the requesting event
   * @vint_status_bit:	Virtual interrupt status bit to be used for the event
   * @s_host:		Secondary host ID to which the irq/event is being
   *			requested for.
   * @type:		Request type irq set or release.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_manage_irq(const struct ti_sci_handle *handle,
  			     u32 valid_params, u16 src_id, u16 src_index,
  			     u16 dst_id, u16 dst_host_irq, u16 ia_id, u16 vint,
  			     u16 global_event, u8 vint_status_bit, u8 s_host,
  			     u16 type)
  {
  	struct ti_sci_msg_req_manage_irq *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, type, TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_manage_irq *)xfer->xfer_buf;
  	req->valid_params = valid_params;
  	req->src_id = src_id;
  	req->src_index = src_index;
  	req->dst_id = dst_id;
  	req->dst_host_irq = dst_host_irq;
  	req->ia_id = ia_id;
  	req->vint = vint;
  	req->global_event = global_event;
  	req->vint_status_bit = vint_status_bit;
  	req->secondary_host = s_host;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_set_irq() - Helper api to configure the irq route between the
   *		      requested source and destination
   * @handle:		Pointer to TISCI handle.
   * @valid_params:	Bit fields defining the validity of certain params
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @dst_id:		Device ID of the IRQ destination
   * @dst_host_irq:	IRQ number of the destination device
   * @ia_id:		Device ID of the IA, if the IRQ flows through this IA
   * @vint:		Virtual interrupt to be used within the IA
   * @global_event:	Global event number to be used for the requesting event
   * @vint_status_bit:	Virtual interrupt status bit to be used for the event
   * @s_host:		Secondary host ID to which the irq/event is being
   *			requested for.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_set_irq(const struct ti_sci_handle *handle, u32 valid_params,
  			  u16 src_id, u16 src_index, u16 dst_id,
  			  u16 dst_host_irq, u16 ia_id, u16 vint,
  			  u16 global_event, u8 vint_status_bit, u8 s_host)
  {
  	pr_debug("%s: IRQ set with valid_params = 0x%x from src = %d, index = %d, to dst = %d, irq = %d,via ia_id = %d, vint = %d, global event = %d,status_bit = %d\n",
  		 __func__, valid_params, src_id, src_index,
  		 dst_id, dst_host_irq, ia_id, vint, global_event,
  		 vint_status_bit);
  
  	return ti_sci_manage_irq(handle, valid_params, src_id, src_index,
  				 dst_id, dst_host_irq, ia_id, vint,
  				 global_event, vint_status_bit, s_host,
  				 TI_SCI_MSG_SET_IRQ);
  }
  
  /**
   * ti_sci_free_irq() - Helper api to free the irq route between the
   *			   requested source and destination
   * @handle:		Pointer to TISCI handle.
   * @valid_params:	Bit fields defining the validity of certain params
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @dst_id:		Device ID of the IRQ destination
   * @dst_host_irq:	IRQ number of the destination device
   * @ia_id:		Device ID of the IA, if the IRQ flows through this IA
   * @vint:		Virtual interrupt to be used within the IA
   * @global_event:	Global event number to be used for the requesting event
   * @vint_status_bit:	Virtual interrupt status bit to be used for the event
   * @s_host:		Secondary host ID to which the irq/event is being
   *			requested for.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_free_irq(const struct ti_sci_handle *handle, u32 valid_params,
  			   u16 src_id, u16 src_index, u16 dst_id,
  			   u16 dst_host_irq, u16 ia_id, u16 vint,
  			   u16 global_event, u8 vint_status_bit, u8 s_host)
  {
  	pr_debug("%s: IRQ release with valid_params = 0x%x from src = %d, index = %d, to dst = %d, irq = %d,via ia_id = %d, vint = %d, global event = %d,status_bit = %d\n",
  		 __func__, valid_params, src_id, src_index,
  		 dst_id, dst_host_irq, ia_id, vint, global_event,
  		 vint_status_bit);
  
  	return ti_sci_manage_irq(handle, valid_params, src_id, src_index,
  				 dst_id, dst_host_irq, ia_id, vint,
  				 global_event, vint_status_bit, s_host,
  				 TI_SCI_MSG_FREE_IRQ);
  }
  
  /**
   * ti_sci_cmd_set_irq() - Configure a host irq route between the requested
   *			  source and destination.
   * @handle:		Pointer to TISCI handle.
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @dst_id:		Device ID of the IRQ destination
   * @dst_host_irq:	IRQ number of the destination device
   * @vint_irq:		Boolean specifying if this interrupt belongs to
   *			Interrupt Aggregator.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_set_irq(const struct ti_sci_handle *handle, u16 src_id,
  			      u16 src_index, u16 dst_id, u16 dst_host_irq)
  {
  	u32 valid_params = MSG_FLAG_DST_ID_VALID | MSG_FLAG_DST_HOST_IRQ_VALID;
  
  	return ti_sci_set_irq(handle, valid_params, src_id, src_index, dst_id,
  			      dst_host_irq, 0, 0, 0, 0, 0);
  }
  
  /**
   * ti_sci_cmd_set_event_map() - Configure an event based irq route between the
   *				requested source and Interrupt Aggregator.
   * @handle:		Pointer to TISCI handle.
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @ia_id:		Device ID of the IA, if the IRQ flows through this IA
   * @vint:		Virtual interrupt to be used within the IA
   * @global_event:	Global event number to be used for the requesting event
   * @vint_status_bit:	Virtual interrupt status bit to be used for the event
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_set_event_map(const struct ti_sci_handle *handle,
  				    u16 src_id, u16 src_index, u16 ia_id,
  				    u16 vint, u16 global_event,
  				    u8 vint_status_bit)
  {
  	u32 valid_params = MSG_FLAG_IA_ID_VALID | MSG_FLAG_VINT_VALID |
  			   MSG_FLAG_GLB_EVNT_VALID |
  			   MSG_FLAG_VINT_STS_BIT_VALID;
  
  	return ti_sci_set_irq(handle, valid_params, src_id, src_index, 0, 0,
  			      ia_id, vint, global_event, vint_status_bit, 0);
  }
  
  /**
   * ti_sci_cmd_free_irq() - Free a host irq route between the between the
   *			   requested source and destination.
   * @handle:		Pointer to TISCI handle.
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @dst_id:		Device ID of the IRQ destination
   * @dst_host_irq:	IRQ number of the destination device
   * @vint_irq:		Boolean specifying if this interrupt belongs to
   *			Interrupt Aggregator.
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_free_irq(const struct ti_sci_handle *handle, u16 src_id,
  			       u16 src_index, u16 dst_id, u16 dst_host_irq)
  {
  	u32 valid_params = MSG_FLAG_DST_ID_VALID | MSG_FLAG_DST_HOST_IRQ_VALID;
  
  	return ti_sci_free_irq(handle, valid_params, src_id, src_index, dst_id,
  			       dst_host_irq, 0, 0, 0, 0, 0);
  }
  
  /**
   * ti_sci_cmd_free_event_map() - Free an event map between the requested source
   *				 and Interrupt Aggregator.
   * @handle:		Pointer to TISCI handle.
   * @src_id:		Device ID of the IRQ source
   * @src_index:		IRQ source index within the source device
   * @ia_id:		Device ID of the IA, if the IRQ flows through this IA
   * @vint:		Virtual interrupt to be used within the IA
   * @global_event:	Global event number to be used for the requesting event
   * @vint_status_bit:	Virtual interrupt status bit to be used for the event
   *
   * Return: 0 if all went fine, else return appropriate error.
   */
  static int ti_sci_cmd_free_event_map(const struct ti_sci_handle *handle,
  				     u16 src_id, u16 src_index, u16 ia_id,
  				     u16 vint, u16 global_event,
  				     u8 vint_status_bit)
  {
  	u32 valid_params = MSG_FLAG_IA_ID_VALID |
  			   MSG_FLAG_VINT_VALID | MSG_FLAG_GLB_EVNT_VALID |
  			   MSG_FLAG_VINT_STS_BIT_VALID;
  
  	return ti_sci_free_irq(handle, valid_params, src_id, src_index, 0, 0,
  			       ia_id, vint, global_event, vint_status_bit, 0);
  }
  
  /**
   * ti_sci_cmd_ring_config() - configure RA ring
   * @handle:		Pointer to TI SCI handle.
   * @valid_params:	Bitfield defining validity of ring configuration
   *			parameters
   * @nav_id:		Device ID of Navigator Subsystem from which the ring is
   *			allocated
   * @index:		Ring index
   * @addr_lo:		The ring base address lo 32 bits
   * @addr_hi:		The ring base address hi 32 bits
   * @count:		Number of ring elements
   * @mode:		The mode of the ring
   * @size:		The ring element size.
   * @order_id:		Specifies the ring's bus order ID
   *
   * Return: 0 if all went well, else returns appropriate error value.
   *
   * See @ti_sci_msg_rm_ring_cfg_req for more info.
   */
  static int ti_sci_cmd_ring_config(const struct ti_sci_handle *handle,
  				  u32 valid_params, u16 nav_id, u16 index,
  				  u32 addr_lo, u32 addr_hi, u32 count,
  				  u8 mode, u8 size, u8 order_id)
  {
  	struct ti_sci_msg_rm_ring_cfg_req *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR_OR_NULL(handle))
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_RM_RING_CFG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "RM_RA:Message config failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_rm_ring_cfg_req *)xfer->xfer_buf;
  	req->valid_params = valid_params;
  	req->nav_id = nav_id;
  	req->index = index;
  	req->addr_lo = addr_lo;
  	req->addr_hi = addr_hi;
  	req->count = count;
  	req->mode = mode;
  	req->size = size;
  	req->order_id = order_id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "RM_RA:Mbox config send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	dev_dbg(dev, "RM_RA:config ring %u ret:%d\n", index, ret);
  	return ret;
  }
  
  /**
   * ti_sci_cmd_ring_get_config() - get RA ring configuration
   * @handle:	Pointer to TI SCI handle.
   * @nav_id:	Device ID of Navigator Subsystem from which the ring is
   *		allocated
   * @index:	Ring index
   * @addr_lo:	Returns ring's base address lo 32 bits
   * @addr_hi:	Returns ring's base address hi 32 bits
   * @count:	Returns number of ring elements
   * @mode:	Returns mode of the ring
   * @size:	Returns ring element size
   * @order_id:	Returns ring's bus order ID
   *
   * Return: 0 if all went well, else returns appropriate error value.
   *
   * See @ti_sci_msg_rm_ring_get_cfg_req for more info.
   */
  static int ti_sci_cmd_ring_get_config(const struct ti_sci_handle *handle,
  				      u32 nav_id, u32 index, u8 *mode,
  				      u32 *addr_lo, u32 *addr_hi,
  				      u32 *count, u8 *size, u8 *order_id)
  {
  	struct ti_sci_msg_rm_ring_get_cfg_resp *resp;
  	struct ti_sci_msg_rm_ring_get_cfg_req *req;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR_OR_NULL(handle))
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_RM_RING_GET_CFG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev,
  			"RM_RA:Message get config failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_rm_ring_get_cfg_req *)xfer->xfer_buf;
  	req->nav_id = nav_id;
  	req->index = index;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "RM_RA:Mbox get config send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_rm_ring_get_cfg_resp *)xfer->xfer_buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  	} else {
  		if (mode)
  			*mode = resp->mode;
  		if (addr_lo)
  			*addr_lo = resp->addr_lo;
  		if (addr_hi)
  			*addr_hi = resp->addr_hi;
  		if (count)
  			*count = resp->count;
  		if (size)
  			*size = resp->size;
  		if (order_id)
  			*order_id = resp->order_id;
  	};
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	dev_dbg(dev, "RM_RA:get config ring %u ret:%d\n", index, ret);
  	return ret;
  }
  
  /**
   * ti_sci_cmd_rm_psil_pair() - Pair PSI-L source to destination thread
   * @handle:	Pointer to TI SCI handle.
   * @nav_id:	Device ID of Navigator Subsystem which should be used for
   *		pairing
   * @src_thread:	Source PSI-L thread ID
   * @dst_thread: Destination PSI-L thread ID
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_rm_psil_pair(const struct ti_sci_handle *handle,
  				   u32 nav_id, u32 src_thread, u32 dst_thread)
  {
  	struct ti_sci_msg_psil_pair *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_RM_PSIL_PAIR,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "RM_PSIL:Message reconfig failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_psil_pair *)xfer->xfer_buf;
  	req->nav_id = nav_id;
  	req->src_thread = src_thread;
  	req->dst_thread = dst_thread;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "RM_PSIL:Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -EINVAL;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_rm_psil_unpair() - Unpair PSI-L source from destination thread
   * @handle:	Pointer to TI SCI handle.
   * @nav_id:	Device ID of Navigator Subsystem which should be used for
   *		unpairing
   * @src_thread:	Source PSI-L thread ID
   * @dst_thread:	Destination PSI-L thread ID
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_rm_psil_unpair(const struct ti_sci_handle *handle,
  				     u32 nav_id, u32 src_thread, u32 dst_thread)
  {
  	struct ti_sci_msg_psil_unpair *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_RM_PSIL_UNPAIR,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "RM_PSIL:Message reconfig failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_psil_unpair *)xfer->xfer_buf;
  	req->nav_id = nav_id;
  	req->src_thread = src_thread;
  	req->dst_thread = dst_thread;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "RM_PSIL:Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -EINVAL;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_rm_udmap_tx_ch_cfg() - Configure a UDMAP TX channel
   * @handle:	Pointer to TI SCI handle.
   * @params:	Pointer to ti_sci_msg_rm_udmap_tx_ch_cfg TX channel config
   *		structure
   *
   * Return: 0 if all went well, else returns appropriate error value.
   *
   * See @ti_sci_msg_rm_udmap_tx_ch_cfg and @ti_sci_msg_rm_udmap_tx_ch_cfg_req for
   * more info.
   */
  static int ti_sci_cmd_rm_udmap_tx_ch_cfg(const struct ti_sci_handle *handle,
  			const struct ti_sci_msg_rm_udmap_tx_ch_cfg *params)
  {
  	struct ti_sci_msg_rm_udmap_tx_ch_cfg_req *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR_OR_NULL(handle))
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TISCI_MSG_RM_UDMAP_TX_CH_CFG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message TX_CH_CFG alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_rm_udmap_tx_ch_cfg_req *)xfer->xfer_buf;
  	req->valid_params = params->valid_params;
  	req->nav_id = params->nav_id;
  	req->index = params->index;
  	req->tx_pause_on_err = params->tx_pause_on_err;
  	req->tx_filt_einfo = params->tx_filt_einfo;
  	req->tx_filt_pswords = params->tx_filt_pswords;
  	req->tx_atype = params->tx_atype;
  	req->tx_chan_type = params->tx_chan_type;
  	req->tx_supr_tdpkt = params->tx_supr_tdpkt;
  	req->tx_fetch_size = params->tx_fetch_size;
  	req->tx_credit_count = params->tx_credit_count;
  	req->txcq_qnum = params->txcq_qnum;
  	req->tx_priority = params->tx_priority;
  	req->tx_qos = params->tx_qos;
  	req->tx_orderid = params->tx_orderid;
  	req->fdepth = params->fdepth;
  	req->tx_sched_priority = params->tx_sched_priority;
  	req->tx_burst_size = params->tx_burst_size;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send TX_CH_CFG fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -EINVAL;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	dev_dbg(dev, "TX_CH_CFG: chn %u ret:%u\n", params->index, ret);
  	return ret;
  }
  
  /**
   * ti_sci_cmd_rm_udmap_rx_ch_cfg() - Configure a UDMAP RX channel
   * @handle:	Pointer to TI SCI handle.
   * @params:	Pointer to ti_sci_msg_rm_udmap_rx_ch_cfg RX channel config
   *		structure
   *
   * Return: 0 if all went well, else returns appropriate error value.
   *
   * See @ti_sci_msg_rm_udmap_rx_ch_cfg and @ti_sci_msg_rm_udmap_rx_ch_cfg_req for
   * more info.
   */
  static int ti_sci_cmd_rm_udmap_rx_ch_cfg(const struct ti_sci_handle *handle,
  			const struct ti_sci_msg_rm_udmap_rx_ch_cfg *params)
  {
  	struct ti_sci_msg_rm_udmap_rx_ch_cfg_req *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR_OR_NULL(handle))
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TISCI_MSG_RM_UDMAP_RX_CH_CFG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message RX_CH_CFG alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_rm_udmap_rx_ch_cfg_req *)xfer->xfer_buf;
  	req->valid_params = params->valid_params;
  	req->nav_id = params->nav_id;
  	req->index = params->index;
  	req->rx_fetch_size = params->rx_fetch_size;
  	req->rxcq_qnum = params->rxcq_qnum;
  	req->rx_priority = params->rx_priority;
  	req->rx_qos = params->rx_qos;
  	req->rx_orderid = params->rx_orderid;
  	req->rx_sched_priority = params->rx_sched_priority;
  	req->flowid_start = params->flowid_start;
  	req->flowid_cnt = params->flowid_cnt;
  	req->rx_pause_on_err = params->rx_pause_on_err;
  	req->rx_atype = params->rx_atype;
  	req->rx_chan_type = params->rx_chan_type;
  	req->rx_ignore_short = params->rx_ignore_short;
  	req->rx_ignore_long = params->rx_ignore_long;
  	req->rx_burst_size = params->rx_burst_size;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send RX_CH_CFG fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -EINVAL;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	dev_dbg(dev, "RX_CH_CFG: chn %u ret:%d\n", params->index, ret);
  	return ret;
  }
  
  /**
   * ti_sci_cmd_rm_udmap_rx_flow_cfg() - Configure UDMAP RX FLOW
   * @handle:	Pointer to TI SCI handle.
   * @params:	Pointer to ti_sci_msg_rm_udmap_flow_cfg RX FLOW config
   *		structure
   *
   * Return: 0 if all went well, else returns appropriate error value.
   *
   * See @ti_sci_msg_rm_udmap_flow_cfg and @ti_sci_msg_rm_udmap_flow_cfg_req for
   * more info.
   */
  static int ti_sci_cmd_rm_udmap_rx_flow_cfg(const struct ti_sci_handle *handle,
  			const struct ti_sci_msg_rm_udmap_flow_cfg *params)
  {
  	struct ti_sci_msg_rm_udmap_flow_cfg_req *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info;
  	struct device *dev;
  	int ret = 0;
  
  	if (IS_ERR_OR_NULL(handle))
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TISCI_MSG_RM_UDMAP_FLOW_CFG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "RX_FL_CFG: Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_rm_udmap_flow_cfg_req *)xfer->xfer_buf;
  	req->valid_params = params->valid_params;
  	req->nav_id = params->nav_id;
  	req->flow_index = params->flow_index;
  	req->rx_einfo_present = params->rx_einfo_present;
  	req->rx_psinfo_present = params->rx_psinfo_present;
  	req->rx_error_handling = params->rx_error_handling;
  	req->rx_desc_type = params->rx_desc_type;
  	req->rx_sop_offset = params->rx_sop_offset;
  	req->rx_dest_qnum = params->rx_dest_qnum;
  	req->rx_src_tag_hi = params->rx_src_tag_hi;
  	req->rx_src_tag_lo = params->rx_src_tag_lo;
  	req->rx_dest_tag_hi = params->rx_dest_tag_hi;
  	req->rx_dest_tag_lo = params->rx_dest_tag_lo;
  	req->rx_src_tag_hi_sel = params->rx_src_tag_hi_sel;
  	req->rx_src_tag_lo_sel = params->rx_src_tag_lo_sel;
  	req->rx_dest_tag_hi_sel = params->rx_dest_tag_hi_sel;
  	req->rx_dest_tag_lo_sel = params->rx_dest_tag_lo_sel;
  	req->rx_fdq0_sz0_qnum = params->rx_fdq0_sz0_qnum;
  	req->rx_fdq1_qnum = params->rx_fdq1_qnum;
  	req->rx_fdq2_qnum = params->rx_fdq2_qnum;
  	req->rx_fdq3_qnum = params->rx_fdq3_qnum;
  	req->rx_ps_location = params->rx_ps_location;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "RX_FL_CFG: Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
  	ret = ti_sci_is_response_ack(resp) ? 0 : -EINVAL;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  	dev_dbg(info->dev, "RX_FL_CFG: %u ret:%d\n", params->flow_index, ret);
  	return ret;
  }
  
  /**
   * ti_sci_cmd_proc_request() - Command to request a physical processor control
   * @handle:	Pointer to TI SCI handle
   * @proc_id:	Processor ID this request is for
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_request(const struct ti_sci_handle *handle,
  				   u8 proc_id)
  {
  	struct ti_sci_msg_req_proc_request *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_REQUEST,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_proc_request *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_proc_release() - Command to release a physical processor control
   * @handle:	Pointer to TI SCI handle
   * @proc_id:	Processor ID this request is for
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_release(const struct ti_sci_handle *handle,
  				   u8 proc_id)
  {
  	struct ti_sci_msg_req_proc_release *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_RELEASE,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_proc_release *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_proc_handover() - Command to handover a physical processor
   *				control to a host in the processor's access
   *				control list.
   * @handle:	Pointer to TI SCI handle
   * @proc_id:	Processor ID this request is for
   * @host_id:	Host ID to get the control of the processor
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_handover(const struct ti_sci_handle *handle,
  				    u8 proc_id, u8 host_id)
  {
  	struct ti_sci_msg_req_proc_handover *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_HANDOVER,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_proc_handover *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  	req->host_id = host_id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_proc_set_config() - Command to set the processor boot
   *				    configuration flags
   * @handle:		Pointer to TI SCI handle
   * @proc_id:		Processor ID this request is for
   * @config_flags_set:	Configuration flags to be set
   * @config_flags_clear:	Configuration flags to be cleared.
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_set_config(const struct ti_sci_handle *handle,
  				      u8 proc_id, u64 bootvector,
  				      u32 config_flags_set,
  				      u32 config_flags_clear)
  {
  	struct ti_sci_msg_req_set_config *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CONFIG,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_config *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  	req->bootvector_low = bootvector & TI_SCI_ADDR_LOW_MASK;
  	req->bootvector_high = (bootvector & TI_SCI_ADDR_HIGH_MASK) >>
  				TI_SCI_ADDR_HIGH_SHIFT;
  	req->config_flags_set = config_flags_set;
  	req->config_flags_clear = config_flags_clear;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_proc_set_control() - Command to set the processor boot
   *				     control flags
   * @handle:			Pointer to TI SCI handle
   * @proc_id:			Processor ID this request is for
   * @control_flags_set:		Control flags to be set
   * @control_flags_clear:	Control flags to be cleared
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_set_control(const struct ti_sci_handle *handle,
  				       u8 proc_id, u32 control_flags_set,
  				       u32 control_flags_clear)
  {
  	struct ti_sci_msg_req_set_ctrl *req;
  	struct ti_sci_msg_hdr *resp;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CTRL,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_set_ctrl *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  	req->control_flags_set = control_flags_set;
  	req->control_flags_clear = control_flags_clear;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
  
  	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /**
   * ti_sci_cmd_get_boot_status() - Command to get the processor boot status
   * @handle:	Pointer to TI SCI handle
   * @proc_id:	Processor ID this request is for
   *
   * Return: 0 if all went well, else returns appropriate error value.
   */
  static int ti_sci_cmd_proc_get_status(const struct ti_sci_handle *handle,
  				      u8 proc_id, u64 *bv, u32 *cfg_flags,
  				      u32 *ctrl_flags, u32 *sts_flags)
  {
  	struct ti_sci_msg_resp_get_status *resp;
  	struct ti_sci_msg_req_get_status *req;
  	struct ti_sci_info *info;
  	struct ti_sci_xfer *xfer;
  	struct device *dev;
  	int ret = 0;
  
  	if (!handle)
  		return -EINVAL;
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  
  	info = handle_to_ti_sci_info(handle);
  	dev = info->dev;
  
  	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_STATUS,
  				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
  				   sizeof(*req), sizeof(*resp));
  	if (IS_ERR(xfer)) {
  		ret = PTR_ERR(xfer);
  		dev_err(dev, "Message alloc failed(%d)\n", ret);
  		return ret;
  	}
  	req = (struct ti_sci_msg_req_get_status *)xfer->xfer_buf;
  	req->processor_id = proc_id;
  
  	ret = ti_sci_do_xfer(info, xfer);
  	if (ret) {
  		dev_err(dev, "Mbox send fail %d\n", ret);
  		goto fail;
  	}
  
  	resp = (struct ti_sci_msg_resp_get_status *)xfer->tx_message.buf;
  
  	if (!ti_sci_is_response_ack(resp)) {
  		ret = -ENODEV;
  	} else {
  		*bv = (resp->bootvector_low & TI_SCI_ADDR_LOW_MASK) |
  		      (((u64)resp->bootvector_high << TI_SCI_ADDR_HIGH_SHIFT) &
  		       TI_SCI_ADDR_HIGH_MASK);
  		*cfg_flags = resp->config_flags;
  		*ctrl_flags = resp->control_flags;
  		*sts_flags = resp->status_flags;
  	}
  
  fail:
  	ti_sci_put_one_xfer(&info->minfo, xfer);
  
  	return ret;
  }
  
  /*
   * ti_sci_setup_ops() - Setup the operations structures
   * @info:	pointer to TISCI pointer
   */
  static void ti_sci_setup_ops(struct ti_sci_info *info)
  {
  	struct ti_sci_ops *ops = &info->handle.ops;
  	struct ti_sci_core_ops *core_ops = &ops->core_ops;
  	struct ti_sci_dev_ops *dops = &ops->dev_ops;
  	struct ti_sci_clk_ops *cops = &ops->clk_ops;
  	struct ti_sci_rm_core_ops *rm_core_ops = &ops->rm_core_ops;
  	struct ti_sci_rm_irq_ops *iops = &ops->rm_irq_ops;
  	struct ti_sci_rm_ringacc_ops *rops = &ops->rm_ring_ops;
  	struct ti_sci_rm_psil_ops *psilops = &ops->rm_psil_ops;
  	struct ti_sci_rm_udmap_ops *udmap_ops = &ops->rm_udmap_ops;
  	struct ti_sci_proc_ops *pops = &ops->proc_ops;
  
  	core_ops->reboot_device = ti_sci_cmd_core_reboot;
  
  	dops->get_device = ti_sci_cmd_get_device;
  	dops->idle_device = ti_sci_cmd_idle_device;
  	dops->put_device = ti_sci_cmd_put_device;
  
  	dops->is_valid = ti_sci_cmd_dev_is_valid;
  	dops->get_context_loss_count = ti_sci_cmd_dev_get_clcnt;
  	dops->is_idle = ti_sci_cmd_dev_is_idle;
  	dops->is_stop = ti_sci_cmd_dev_is_stop;
  	dops->is_on = ti_sci_cmd_dev_is_on;
  	dops->is_transitioning = ti_sci_cmd_dev_is_trans;
  	dops->set_device_resets = ti_sci_cmd_set_device_resets;
  	dops->get_device_resets = ti_sci_cmd_get_device_resets;
  
  	cops->get_clock = ti_sci_cmd_get_clock;
  	cops->idle_clock = ti_sci_cmd_idle_clock;
  	cops->put_clock = ti_sci_cmd_put_clock;
  	cops->is_auto = ti_sci_cmd_clk_is_auto;
  	cops->is_on = ti_sci_cmd_clk_is_on;
  	cops->is_off = ti_sci_cmd_clk_is_off;
  
  	cops->set_parent = ti_sci_cmd_clk_set_parent;
  	cops->get_parent = ti_sci_cmd_clk_get_parent;
  	cops->get_num_parents = ti_sci_cmd_clk_get_num_parents;
  
  	cops->get_best_match_freq = ti_sci_cmd_clk_get_match_freq;
  	cops->set_freq = ti_sci_cmd_clk_set_freq;
  	cops->get_freq = ti_sci_cmd_clk_get_freq;
  
  	rm_core_ops->get_range = ti_sci_cmd_get_resource_range;
  	rm_core_ops->get_range_from_shost =
  				ti_sci_cmd_get_resource_range_from_shost;
  
  	iops->set_irq = ti_sci_cmd_set_irq;
  	iops->set_event_map = ti_sci_cmd_set_event_map;
  	iops->free_irq = ti_sci_cmd_free_irq;
  	iops->free_event_map = ti_sci_cmd_free_event_map;
  
  	rops->config = ti_sci_cmd_ring_config;
  	rops->get_config = ti_sci_cmd_ring_get_config;
  
  	psilops->pair = ti_sci_cmd_rm_psil_pair;
  	psilops->unpair = ti_sci_cmd_rm_psil_unpair;
  
  	udmap_ops->tx_ch_cfg = ti_sci_cmd_rm_udmap_tx_ch_cfg;
  	udmap_ops->rx_ch_cfg = ti_sci_cmd_rm_udmap_rx_ch_cfg;
  	udmap_ops->rx_flow_cfg = ti_sci_cmd_rm_udmap_rx_flow_cfg;
  
  	pops->request = ti_sci_cmd_proc_request;
  	pops->release = ti_sci_cmd_proc_release;
  	pops->handover = ti_sci_cmd_proc_handover;
  	pops->set_config = ti_sci_cmd_proc_set_config;
  	pops->set_control = ti_sci_cmd_proc_set_control;
  	pops->get_status = ti_sci_cmd_proc_get_status;
  }
  
  /**
   * ti_sci_get_handle() - Get the TI SCI handle for a device
   * @dev:	Pointer to device for which we want SCI handle
   *
   * NOTE: The function does not track individual clients of the framework
   * and is expected to be maintained by caller of TI SCI protocol library.
   * ti_sci_put_handle must be balanced with successful ti_sci_get_handle
   * Return: pointer to handle if successful, else:
   * -EPROBE_DEFER if the instance is not ready
   * -ENODEV if the required node handler is missing
   * -EINVAL if invalid conditions are encountered.
   */
  const struct ti_sci_handle *ti_sci_get_handle(struct device *dev)
  {
  	struct device_node *ti_sci_np;
  	struct list_head *p;
  	struct ti_sci_handle *handle = NULL;
  	struct ti_sci_info *info;
  
  	if (!dev) {
  		pr_err("I need a device pointer\n");
  		return ERR_PTR(-EINVAL);
  	}
  	ti_sci_np = of_get_parent(dev->of_node);
  	if (!ti_sci_np) {
  		dev_err(dev, "No OF information\n");
  		return ERR_PTR(-EINVAL);
  	}
  
  	mutex_lock(&ti_sci_list_mutex);
  	list_for_each(p, &ti_sci_list) {
  		info = list_entry(p, struct ti_sci_info, node);
  		if (ti_sci_np == info->dev->of_node) {
  			handle = &info->handle;
  			info->users++;
  			break;
  		}
  	}
  	mutex_unlock(&ti_sci_list_mutex);
  	of_node_put(ti_sci_np);
  
  	if (!handle)
  		return ERR_PTR(-EPROBE_DEFER);
  
  	return handle;
  }
  EXPORT_SYMBOL_GPL(ti_sci_get_handle);
  
  /**
   * ti_sci_put_handle() - Release the handle acquired by ti_sci_get_handle
   * @handle:	Handle acquired by ti_sci_get_handle
   *
   * NOTE: The function does not track individual clients of the framework
   * and is expected to be maintained by caller of TI SCI protocol library.
   * ti_sci_put_handle must be balanced with successful ti_sci_get_handle
   *
   * Return: 0 is successfully released
   * if an error pointer was passed, it returns the error value back,
   * if null was passed, it returns -EINVAL;
   */
  int ti_sci_put_handle(const struct ti_sci_handle *handle)
  {
  	struct ti_sci_info *info;
  
  	if (IS_ERR(handle))
  		return PTR_ERR(handle);
  	if (!handle)
  		return -EINVAL;
  
  	info = handle_to_ti_sci_info(handle);
  	mutex_lock(&ti_sci_list_mutex);
  	if (!WARN_ON(!info->users))
  		info->users--;
  	mutex_unlock(&ti_sci_list_mutex);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(ti_sci_put_handle);
  
  static void devm_ti_sci_release(struct device *dev, void *res)
  {
  	const struct ti_sci_handle **ptr = res;
  	const struct ti_sci_handle *handle = *ptr;
  	int ret;
  
  	ret = ti_sci_put_handle(handle);
  	if (ret)
  		dev_err(dev, "failed to put handle %d\n", ret);
  }
  
  /**
   * devm_ti_sci_get_handle() - Managed get handle
   * @dev:	device for which we want SCI handle for.
   *
   * NOTE: This releases the handle once the device resources are
   * no longer needed. MUST NOT BE released with ti_sci_put_handle.
   * The function does not track individual clients of the framework
   * and is expected to be maintained by caller of TI SCI protocol library.
   *
   * Return: 0 if all went fine, else corresponding error.
   */
  const struct ti_sci_handle *devm_ti_sci_get_handle(struct device *dev)
  {
  	const struct ti_sci_handle **ptr;
  	const struct ti_sci_handle *handle;
  
  	ptr = devres_alloc(devm_ti_sci_release, sizeof(*ptr), GFP_KERNEL);
  	if (!ptr)
  		return ERR_PTR(-ENOMEM);
  	handle = ti_sci_get_handle(dev);
  
  	if (!IS_ERR(handle)) {
  		*ptr = handle;
  		devres_add(dev, ptr);
  	} else {
  		devres_free(ptr);
  	}
  
  	return handle;
  }
  EXPORT_SYMBOL_GPL(devm_ti_sci_get_handle);
  
  /**
   * ti_sci_get_by_phandle() - Get the TI SCI handle using DT phandle
   * @np:		device node
   * @property:	property name containing phandle on TISCI node
   *
   * NOTE: The function does not track individual clients of the framework
   * and is expected to be maintained by caller of TI SCI protocol library.
   * ti_sci_put_handle must be balanced with successful ti_sci_get_by_phandle
   * Return: pointer to handle if successful, else:
   * -EPROBE_DEFER if the instance is not ready
   * -ENODEV if the required node handler is missing
   * -EINVAL if invalid conditions are encountered.
   */
  const struct ti_sci_handle *ti_sci_get_by_phandle(struct device_node *np,
  						  const char *property)
  {
  	struct ti_sci_handle *handle = NULL;
  	struct device_node *ti_sci_np;
  	struct ti_sci_info *info;
  	struct list_head *p;
  
  	if (!np) {
  		pr_err("I need a device pointer\n");
  		return ERR_PTR(-EINVAL);
  	}
  
  	ti_sci_np = of_parse_phandle(np, property, 0);
  	if (!ti_sci_np)
  		return ERR_PTR(-ENODEV);
  
  	mutex_lock(&ti_sci_list_mutex);
  	list_for_each(p, &ti_sci_list) {
  		info = list_entry(p, struct ti_sci_info, node);
  		if (ti_sci_np == info->dev->of_node) {
  			handle = &info->handle;
  			info->users++;
  			break;
  		}
  	}
  	mutex_unlock(&ti_sci_list_mutex);
  	of_node_put(ti_sci_np);
  
  	if (!handle)
  		return ERR_PTR(-EPROBE_DEFER);
  
  	return handle;
  }
  EXPORT_SYMBOL_GPL(ti_sci_get_by_phandle);
  
  /**
   * devm_ti_sci_get_by_phandle() - Managed get handle using phandle
   * @dev:	Device pointer requesting TISCI handle
   * @property:	property name containing phandle on TISCI node
   *
   * NOTE: This releases the handle once the device resources are
   * no longer needed. MUST NOT BE released with ti_sci_put_handle.
   * The function does not track individual clients of the framework
   * and is expected to be maintained by caller of TI SCI protocol library.
   *
   * Return: 0 if all went fine, else corresponding error.
   */
  const struct ti_sci_handle *devm_ti_sci_get_by_phandle(struct device *dev,
  						       const char *property)
  {
  	const struct ti_sci_handle *handle;
  	const struct ti_sci_handle **ptr;
  
  	ptr = devres_alloc(devm_ti_sci_release, sizeof(*ptr), GFP_KERNEL);
  	if (!ptr)
  		return ERR_PTR(-ENOMEM);
  	handle = ti_sci_get_by_phandle(dev_of_node(dev), property);
  
  	if (!IS_ERR(handle)) {
  		*ptr = handle;
  		devres_add(dev, ptr);
  	} else {
  		devres_free(ptr);
  	}
  
  	return handle;
  }
  EXPORT_SYMBOL_GPL(devm_ti_sci_get_by_phandle);
  
  /**
   * ti_sci_get_free_resource() - Get a free resource from TISCI resource.
   * @res:	Pointer to the TISCI resource
   *
   * Return: resource num if all went ok else TI_SCI_RESOURCE_NULL.
   */
  u16 ti_sci_get_free_resource(struct ti_sci_resource *res)
  {
  	unsigned long flags;
  	u16 set, free_bit;
  
  	raw_spin_lock_irqsave(&res->lock, flags);
  	for (set = 0; set < res->sets; set++) {
  		free_bit = find_first_zero_bit(res->desc[set].res_map,
  					       res->desc[set].num);
  		if (free_bit != res->desc[set].num) {
  			set_bit(free_bit, res->desc[set].res_map);
  			raw_spin_unlock_irqrestore(&res->lock, flags);
  			return res->desc[set].start + free_bit;
  		}
  	}
  	raw_spin_unlock_irqrestore(&res->lock, flags);
  
  	return TI_SCI_RESOURCE_NULL;
  }
  EXPORT_SYMBOL_GPL(ti_sci_get_free_resource);
  
  /**
   * ti_sci_release_resource() - Release a resource from TISCI resource.
   * @res:	Pointer to the TISCI resource
   * @id:		Resource id to be released.
   */
  void ti_sci_release_resource(struct ti_sci_resource *res, u16 id)
  {
  	unsigned long flags;
  	u16 set;
  
  	raw_spin_lock_irqsave(&res->lock, flags);
  	for (set = 0; set < res->sets; set++) {
  		if (res->desc[set].start <= id &&
  		    (res->desc[set].num + res->desc[set].start) > id)
  			clear_bit(id - res->desc[set].start,
  				  res->desc[set].res_map);
  	}
  	raw_spin_unlock_irqrestore(&res->lock, flags);
  }
  EXPORT_SYMBOL_GPL(ti_sci_release_resource);
  
  /**
   * ti_sci_get_num_resources() - Get the number of resources in TISCI resource
   * @res:	Pointer to the TISCI resource
   *
   * Return: Total number of available resources.
   */
  u32 ti_sci_get_num_resources(struct ti_sci_resource *res)
  {
  	u32 set, count = 0;
  
  	for (set = 0; set < res->sets; set++)
  		count += res->desc[set].num;
  
  	return count;
  }
  EXPORT_SYMBOL_GPL(ti_sci_get_num_resources);
  
  /**
   * devm_ti_sci_get_of_resource() - Get a TISCI resource assigned to a device
   * @handle:	TISCI handle
   * @dev:	Device pointer to which the resource is assigned
   * @dev_id:	TISCI device id to which the resource is assigned
   * @of_prop:	property name by which the resource are represented
   *
   * Return: Pointer to ti_sci_resource if all went well else appropriate
   *	   error pointer.
   */
  struct ti_sci_resource *
  devm_ti_sci_get_of_resource(const struct ti_sci_handle *handle,
  			    struct device *dev, u32 dev_id, char *of_prop)
  {
  	struct ti_sci_resource *res;
  	bool valid_set = false;
  	u32 resource_subtype;
  	int i, ret;
  
  	res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL);
  	if (!res)
  		return ERR_PTR(-ENOMEM);
  
  	ret = of_property_count_elems_of_size(dev_of_node(dev), of_prop,
  					      sizeof(u32));
  	if (ret < 0) {
  		dev_err(dev, "%s resource type ids not available\n", of_prop);
  		return ERR_PTR(ret);
  	}
  	res->sets = ret;
  
  	res->desc = devm_kcalloc(dev, res->sets, sizeof(*res->desc),
  				 GFP_KERNEL);
  	if (!res->desc)
  		return ERR_PTR(-ENOMEM);
  
  	for (i = 0; i < res->sets; i++) {
  		ret = of_property_read_u32_index(dev_of_node(dev), of_prop, i,
  						 &resource_subtype);
  		if (ret)
  			return ERR_PTR(-EINVAL);
  
  		ret = handle->ops.rm_core_ops.get_range(handle, dev_id,
  							resource_subtype,
  							&res->desc[i].start,
  							&res->desc[i].num);
  		if (ret) {
  			dev_dbg(dev, "dev = %d subtype %d not allocated for this host\n",
  				dev_id, resource_subtype);
  			res->desc[i].start = 0;
  			res->desc[i].num = 0;
  			continue;
  		}
  
  		dev_dbg(dev, "dev = %d, subtype = %d, start = %d, num = %d\n",
  			dev_id, resource_subtype, res->desc[i].start,
  			res->desc[i].num);
  
  		valid_set = true;
  		res->desc[i].res_map =
  			devm_kzalloc(dev, BITS_TO_LONGS(res->desc[i].num) *
  				     sizeof(*res->desc[i].res_map), GFP_KERNEL);
  		if (!res->desc[i].res_map)
  			return ERR_PTR(-ENOMEM);
  	}
  	raw_spin_lock_init(&res->lock);
  
  	if (valid_set)
  		return res;
  
  	return ERR_PTR(-EINVAL);
  }
  
  static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode,
  				void *cmd)
  {
  	struct ti_sci_info *info = reboot_to_ti_sci_info(nb);
  	const struct ti_sci_handle *handle = &info->handle;
  
  	ti_sci_cmd_core_reboot(handle);
  
  	/* call fail OR pass, we should not be here in the first place */
  	return NOTIFY_BAD;
  }
  
  /* Description for K2G */
  static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
  	.default_host_id = 2,
  	/* Conservative duration */
  	.max_rx_timeout_ms = 1000,
  	/* Limited by MBOX_TX_QUEUE_LEN. K2G can handle upto 128 messages! */
  	.max_msgs = 20,
  	.max_msg_size = 64,
  	.rm_type_map = NULL,
  };
  
  static struct ti_sci_rm_type_map ti_sci_am654_rm_type_map[] = {
  	{.dev_id = 56, .type = 0x00b}, /* GIC_IRQ */
  	{.dev_id = 179, .type = 0x000}, /* MAIN_NAV_UDMASS_IA0 */
  	{.dev_id = 187, .type = 0x009}, /* MAIN_NAV_RA */
  	{.dev_id = 188, .type = 0x006}, /* MAIN_NAV_UDMAP */
  	{.dev_id = 194, .type = 0x007}, /* MCU_NAV_UDMAP */
  	{.dev_id = 195, .type = 0x00a}, /* MCU_NAV_RA */
  	{.dev_id = 0, .type = 0x000}, /* end of table */
  };
  
  /* Description for AM654 */
  static const struct ti_sci_desc ti_sci_pmmc_am654_desc = {
  	.default_host_id = 12,
  	/* Conservative duration */
  	.max_rx_timeout_ms = 10000,
  	/* Limited by MBOX_TX_QUEUE_LEN. K2G can handle upto 128 messages! */
  	.max_msgs = 20,
  	.max_msg_size = 60,
  	.rm_type_map = ti_sci_am654_rm_type_map,
  };
  
  static const struct of_device_id ti_sci_of_match[] = {
  	{.compatible = "ti,k2g-sci", .data = &ti_sci_pmmc_k2g_desc},
  	{.compatible = "ti,am654-sci", .data = &ti_sci_pmmc_am654_desc},
  	{ /* Sentinel */ },
  };
  MODULE_DEVICE_TABLE(of, ti_sci_of_match);
  
  static int ti_sci_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	const struct of_device_id *of_id;
  	const struct ti_sci_desc *desc;
  	struct ti_sci_xfer *xfer;
  	struct ti_sci_info *info = NULL;
  	struct ti_sci_xfers_info *minfo;
  	struct mbox_client *cl;
  	int ret = -EINVAL;
  	int i;
  	int reboot = 0;
  	u32 h_id;
  
  	of_id = of_match_device(ti_sci_of_match, dev);
  	if (!of_id) {
  		dev_err(dev, "OF data missing\n");
  		return -EINVAL;
  	}
  	desc = of_id->data;
  
  	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
  	if (!info)
  		return -ENOMEM;
  
  	info->dev = dev;
  	info->desc = desc;
  	ret = of_property_read_u32(dev->of_node, "ti,host-id", &h_id);
  	/* if the property is not present in DT, use a default from desc */
  	if (ret < 0) {
  		info->host_id = info->desc->default_host_id;
  	} else {
  		if (!h_id) {
  			dev_warn(dev, "Host ID 0 is reserved for firmware\n");
  			info->host_id = info->desc->default_host_id;
  		} else {
  			info->host_id = h_id;
  		}
  	}
  
  	reboot = of_property_read_bool(dev->of_node,
  				       "ti,system-reboot-controller");
  	INIT_LIST_HEAD(&info->node);
  	minfo = &info->minfo;
  
  	/*
  	 * Pre-allocate messages
  	 * NEVER allocate more than what we can indicate in hdr.seq
  	 * if we have data description bug, force a fix..
  	 */
  	if (WARN_ON(desc->max_msgs >=
  		    1 << 8 * sizeof(((struct ti_sci_msg_hdr *)0)->seq)))
  		return -EINVAL;
  
  	minfo->xfer_block = devm_kcalloc(dev,
  					 desc->max_msgs,
  					 sizeof(*minfo->xfer_block),
  					 GFP_KERNEL);
  	if (!minfo->xfer_block)
  		return -ENOMEM;
  
  	minfo->xfer_alloc_table = devm_kcalloc(dev,
  					       BITS_TO_LONGS(desc->max_msgs),
  					       sizeof(unsigned long),
  					       GFP_KERNEL);
  	if (!minfo->xfer_alloc_table)
  		return -ENOMEM;
  	bitmap_zero(minfo->xfer_alloc_table, desc->max_msgs);
  
  	/* Pre-initialize the buffer pointer to pre-allocated buffers */
  	for (i = 0, xfer = minfo->xfer_block; i < desc->max_msgs; i++, xfer++) {
  		xfer->xfer_buf = devm_kcalloc(dev, 1, desc->max_msg_size,
  					      GFP_KERNEL);
  		if (!xfer->xfer_buf)
  			return -ENOMEM;
  
  		xfer->tx_message.buf = xfer->xfer_buf;
  		init_completion(&xfer->done);
  	}
  
  	ret = ti_sci_debugfs_create(pdev, info);
  	if (ret)
  		dev_warn(dev, "Failed to create debug file\n");
  
  	platform_set_drvdata(pdev, info);
  
  	cl = &info->cl;
  	cl->dev = dev;
  	cl->tx_block = false;
  	cl->rx_callback = ti_sci_rx_callback;
  	cl->knows_txdone = true;
  
  	spin_lock_init(&minfo->xfer_lock);
  	sema_init(&minfo->sem_xfer_count, desc->max_msgs);
  
  	info->chan_rx = mbox_request_channel_byname(cl, "rx");
  	if (IS_ERR(info->chan_rx)) {
  		ret = PTR_ERR(info->chan_rx);
  		goto out;
  	}
  
  	info->chan_tx = mbox_request_channel_byname(cl, "tx");
  	if (IS_ERR(info->chan_tx)) {
  		ret = PTR_ERR(info->chan_tx);
  		goto out;
  	}
  	ret = ti_sci_cmd_get_revision(info);
  	if (ret) {
  		dev_err(dev, "Unable to communicate with TISCI(%d)\n", ret);
  		goto out;
  	}
  
  	ti_sci_setup_ops(info);
  
  	if (reboot) {
  		info->nb.notifier_call = tisci_reboot_handler;
  		info->nb.priority = 128;
  
  		ret = register_restart_handler(&info->nb);
  		if (ret) {
  			dev_err(dev, "reboot registration fail(%d)\n", ret);
  			return ret;
  		}
  	}
  
  	dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n",
  		 info->handle.version.abi_major, info->handle.version.abi_minor,
  		 info->handle.version.firmware_revision,
  		 info->handle.version.firmware_description);
  
  	mutex_lock(&ti_sci_list_mutex);
  	list_add_tail(&info->node, &ti_sci_list);
  	mutex_unlock(&ti_sci_list_mutex);
  
  	return of_platform_populate(dev->of_node, NULL, NULL, dev);
  out:
  	if (!IS_ERR(info->chan_tx))
  		mbox_free_channel(info->chan_tx);
  	if (!IS_ERR(info->chan_rx))
  		mbox_free_channel(info->chan_rx);
  	debugfs_remove(info->d);
  	return ret;
  }
  
  static int ti_sci_remove(struct platform_device *pdev)
  {
  	struct ti_sci_info *info;
  	struct device *dev = &pdev->dev;
  	int ret = 0;
  
  	of_platform_depopulate(dev);
  
  	info = platform_get_drvdata(pdev);
  
  	if (info->nb.notifier_call)
  		unregister_restart_handler(&info->nb);
  
  	mutex_lock(&ti_sci_list_mutex);
  	if (info->users)
  		ret = -EBUSY;
  	else
  		list_del(&info->node);
  	mutex_unlock(&ti_sci_list_mutex);
  
  	if (!ret) {
  		ti_sci_debugfs_destroy(pdev, info);
  
  		/* Safe to free channels since no more users */
  		mbox_free_channel(info->chan_tx);
  		mbox_free_channel(info->chan_rx);
  	}
  
  	return ret;
  }
  
  static struct platform_driver ti_sci_driver = {
  	.probe = ti_sci_probe,
  	.remove = ti_sci_remove,
  	.driver = {
  		   .name = "ti-sci",
  		   .of_match_table = of_match_ptr(ti_sci_of_match),
  	},
  };
  module_platform_driver(ti_sci_driver);
  
  MODULE_LICENSE("GPL v2");
  MODULE_DESCRIPTION("TI System Control Interface(SCI) driver");
  MODULE_AUTHOR("Nishanth Menon");
  MODULE_ALIAS("platform:ti-sci");
  